Window Houdini

When a guy does a girl doggie-style in front of a window, then at some point he gets a friend to trade places with him. He runs outside and up to the window, knocks on the glass, and yells HOUDINI! while waving to his girl.

You bend a girl over in your bay window and do her from behind while your brother or friend is over, switch with your friend/brother and let them do your girl then run outside naked and wave to her from the outside the window.